Could the U.S. be a "racial democracy"?

From this thread:
I find the notion that a mixed-race class being impossible/incompatible with an English empire is so frustrating; up until the mid 17th century, there was no "hard-line" between white and not-white with ties to slavery that couldn't be bucked (recognition of free "quadroons" and "octaroons" do show up in pre-1650 Virginian correspondence, before the Barbados and 1705 Slave Codes made such instances more anomalous). In fact, between the [Elizabeth Key] case and Bacon's Rebellion, you really do have one or two smoking-gun PODs that led directly to racial power politics in America; removing or altering one or both means a VERY different environment that IMO would more closely resemble so-called "racial democracy" (which I don't believe actually exists in practical terms, but it's closer to that in Latin America broadly-speaking than not), and pretty much butterfly away any environment where something like Jim Crow could thrive. In fact, the political (as opposed to social) background of the United States, from that POV, doesn't seem particularly vulnerable to butterfly effects, which means you could have the USA (or a near-analogue, more likely) still develop through the 18th Century if similar politics play out in Britain as OTL. Now the 19th Century onward, that's where the real differences from OTL would pop up.
I am intrigued by the prospects of this. Anybody want to weigh in on the prospects of it happening? Or of what the U.S. might look like if things go this way?
 
Slavery had to be maternally inherited to remain a viable institution and while Bacons Rebellion was a tipping point (Though Highly over hyped) the case of John Punch probably the most important smoking gun in American history regarding racial inequity
 
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